Rear Master Cylinder Leak 83 GL1100i


Information and questions on GL1100 Goldwings (1980-1983)
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asch
Posts: 2
Joined: Tue Jul 17, 2012 5:29 pm
Location: Longwood
Motorcycle: 83 GL1100 interstate

Rear Master Cylinder Leak 83 GL1100i

Postby asch » Sun Apr 28, 2013 1:39 pm



Hi guys, longtime lurker, first time poster here. With the help of the how-to's and some of your posts I've been able to fix most of my bikes problems with relative ease, but I've finally run into something that I can't seem to find a solution for.

I ended up rebuilding my GL's Rear Master Cylinder yesterday with a kit from partsnmore, all the replacement, pieces matched the originals and I followed WingAdmin's guide step-for-step. Everything seemed fine durring reassembly, but when I went to bleed the system brake fluid started trickling down the shaft from under the boot.

The cylinder-walls are smooth, the seals seem to fit snugly, and the circlip sits in it's newly-cleaned channel quite nicely. Despite all of this, the cylinder leaks at varying degrees depending on the pressure that's being placed on it.

My bike is one of the few models of the GL1100 that came with the linked brake systems and from what I understand, replacement parts for these systems have become almost impossible to find.

So, what are my options? Any words of wisdom from you guys would be greatly appreciated.



User avatar
virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Rear Master Cylinder Leak 83 GL1100i

Postby virgilmobile » Mon Apr 29, 2013 3:30 pm

It shouldn't leak by your description of the rebuild....except for one thing....Did you verify that the pressure bleeder hole next to the feed hole is open.....
My thought is...if it's plugged,the remaining pressure built up in the master is leaking past the back seal...There should be no pressure in the system until the master cylinder is activated.
You could pump the brakes,let it rest for a few seconds and then crack the bleeder open on the slave cylinder....
There should be very little fluid come out,a few dribbles at most,it should not squirt.
The only other thing is a defect in the master cylinder bore where the seal isn't sealing.

asch
Posts: 2
Joined: Tue Jul 17, 2012 5:29 pm
Location: Longwood
Motorcycle: 83 GL1100 interstate

Re: Rear Master Cylinder Leak 83 GL1100i

Postby asch » Wed May 01, 2013 2:32 pm

Yup, just as the guide said I took a thin piece of wire and reamed out the return port. I'm starting to think that the MC's bore has just gone out of spec and might need resleeving. Thanks for the reply [:

User avatar
virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Rear Master Cylinder Leak 83 GL1100i

Postby virgilmobile » Thu May 02, 2013 2:19 pm

I'm sure 'somewhere' there is a tolerance measurement guide....If you find a fix,please let us know how it's done....re-sleeving is a interesting idea.Perhaps a only option.Kinda like re-sleeving a cylinder...good idea.




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